(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 长沙理工大学 化学与生物工程学院，长沙 410004)
摘 要: 采用高温固相法合成Li4FexTi5-xO12(x=0.025, 0.1, 0.2)负极材料。通过X射线衍射、扫描电镜、充放电性能测试等对掺杂Fe3+的Li4Ti5O12材料的组成、结构、形貌进行表征，并对其电化学性能进行研究。结果表明，所合成的材料具有良好的尖晶石结构，无杂相。适当Fe3+掺杂能细化材料，提高材料的电子导电性，使材料的循环性能得到改善。Li4Fe0.025Ti4.975O12的充电容量最佳，0.1C倍率下首次充电比容量达到162.5 mA·h/g，循环性能较好。
关键字: 锂离子电池；Li4Ti5O12；Fe3+掺杂；负极材料
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;2. School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China）
Abstract:Li4FexTi5-xO12(x=0.025, 0.1, 0.2) anode materials was synthesized by solid-state reaction. Its component, structure, morphology and electrochemical properties were characterized by XRD, SEM and charge-discharge tests. The results show that the synthesized material is pure spinel phase. The particle size of samples with Fe3+-doping decreases in a certain extent, and appropriate amount of Fe3+-doping in Li4Ti5O12 leads to obvious increase in initial and cycling stability, which are ascribe to the smaller particle and better electronic conduction. Li4Fe0.025Ti4.975O12 sample has higher charge capacities than other samples. The initial charge specific capacity of Li4Fe0.025Ti4.975O12 is 162.5 mA·h/g at 0.1 C, showing that it has good cycling behavior.
Key words: lithium ion batteries; Li4Ti5O12; Fe3+-doping; anode materials
